Option table-number-alignment=none

[lvjr]

In issue #510, I only mentioned table-text-alignment, but in fact table-number-alignment=none is also needed (and also for table-alignment). Sorry, I was not very familiar with siunitx package.

[josephwright]

There's a fundamental difference for numbers: there's already table-alignment-mode, as the entire method used to do alignment is selectable. Presumably you'll want table-alignment-mode = none? If you turn off the number alignment, then the columns won't come out with the decimal mark aligned. But that's going to happen whatever one does. Or are you imagining something quite different?

[josephwright]

I'm wondering if there's a (public) way of telling the code is 'inside' a tabularray cell? If so, I could just arrange that the relevant internals don't do anything without needing a setting. (I'm still not really getting what the issue is - (centred) table cells are of one of two forms: \hfil <content> \hfil or \hskip 0pt plus 0.5fill \kern 0pt <content> \hskip 0pt plus 0.5fill.)

[lvjr]

I read the documentation of siunitx again and did some tests. Now I think it is a better choice to let siunitx do table-number-alignment and let tabularray do table-text-alignment only.
It works and we don't need to do anything further (at least for these simple examples I tested)

%  -*- coding: utf-8 -*-
\documentclass{article}
\usepackage{tabularray}
\UseTblrLibrary{siunitx}
\setlength{\parindent}{0pt}
\begin{document}

\section{table-alignment-mode=format}

Tabular:

\begin{tabular}{
 |S[table-column-width=4em,table-format=2.3,table-alignment=left]
 |S[table-column-width=4em,table-format=2.3,table-alignment=center]
 |S[table-column-width=4em,table-format=2.3,table-alignment=right]|
}
\hline
  {A}    & {B}    & {C}    \\
\hline
  11     & 11     & 11     \\
\hline
   2.111 &  2.222 &  2.333 \\
\hline
  33.11  & 33.22  & 33.33  \\
\hline
\end{tabular}

\bigskip

Tabularray:

\begin{tblr}{
 hlines, vlines, columns = {4em},
 colspec={
   Q[si={table-format=2.3,table-number-alignment=left},l]
   Q[si={table-format=2.3,table-number-alignment=center},c]
   Q[si={table-format=2.3,table-number-alignment=right},r]
 }
}
  {{{A}}} & {{{B}}} & {{{C}}} \\
  11      & 11      & 11      \\
   2.111  &  2.222  &  2.333  \\
  33.11   & 33.22   & 33.33   \\
\end{tblr}

\section{table-alignment-mode=none}

Tabular:

\begin{tabular}{
 |S[table-column-width=4em,table-alignment-mode=none,table-alignment=left]
 |S[table-column-width=4em,table-alignment-mode=none,table-alignment=center]
 |S[table-column-width=4em,table-alignment-mode=none,table-alignment=right]|
}
\hline
  {A}    & {B}    & {C}    \\
\hline
  11     & 11     & 11     \\
\hline
   2.111 &  2.222 &  2.333 \\
\hline
  33.11  & 33.22  & 33.33  \\
\hline
\end{tabular}

\bigskip

Tabularray:

\begin{tblr}{
 hlines, vlines, columns = {4em},
 colspec={
   Q[si={table-alignment-mode=none,table-number-alignment=left},l]
   Q[si={table-alignment-mode=none,table-number-alignment=center},c]
   Q[si={table-alignment-mode=none,table-number-alignment=right},r]
 }
}
  {{{A}}} & {{{B}}} & {{{C}}} \\
  11      & 11      & 11      \\
   2.111  &  2.222  &  2.333  \\
  33.11   & 33.22   & 33.33   \\
\end{tblr}

\section{table-alignment-mode=marker}

Tabular:

\begin{tabular}{
 |S[table-column-width=4em,table-alignment-mode=marker]
 |S[table-column-width=4em,table-alignment-mode=marker]
 |S[table-column-width=4em,table-alignment-mode=marker]|
}
\hline
  {A}    & {B}    & {C}    \\
\hline
  11     & 11     & 11     \\
\hline
   2.111 &  2.222 &  2.333 \\
\hline
  33.11  & 33.22  & 33.33  \\
\hline
\end{tabular}

\bigskip

Tabularray:

\begin{tblr}{
 hlines, vlines, columns = {4em},
 colspec={
   Q[si={table-alignment-mode=marker},c]
   Q[si={table-alignment-mode=marker},c]
   Q[si={table-alignment-mode=marker},c]
 }
}
  {{{A}}} & {{{B}}} & {{{C}}} \\
  11      & 11      & 11      \\
   2.111  &  2.222  &  2.333  \\
  33.11   & 33.22   & 33.33   \\
\end{tblr}

\end{document}